linux-kernel - [PATCH 0/3] altra workarounds for PCIE

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Message-Id: <20240827130829.43632-1-alex.bennee@linaro.org>
Date: Tue, 27 Aug 2024 14:08:26 +0100
From: Alex Bennée <alex.bennee@...aro.org>
To: linux-kernel@...r.kernel.org
Cc: kvm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	maz@...nel.org,
	arnd@...aro.org,
	Alex Bennée <alex.bennee@...aro.org>
Subject: [PATCH 0/3] altra workarounds for PCIE_64 with instrumentation

While testing virtio-vulkan on the AVA platform we needed to include
some fixups for its PCI handling. As far as I know these have only
been included in various downstream kernel repos:

  https://community.amperecomputing.com/t/gpu-support-for-ampere-altra/274

The initial two patches are as we found them save for a fix to
align_ldst_regoff_simdfp in the alignment handler. The third and new
patch is trace point instrumentation so we could see how often the
workaround is being invoked.

Combined with Sean's PFN patches:

  https://lore.kernel.org/all/20240726235234.228822-1-seanjc@google.com/

And the Vulkan/Venus support for QEMU:

  https://patchew.org/QEMU/20240822185110.1757429-1-dmitry.osipenko@collabora.com/

I was able to test virtio-vulkan running in a Aarch64 KVM guest hosted
on my AVA platform with an AMD Radeon graphics card plugged into the
PCI bus.

I don't know if there is any interest in getting these upstream but I
figured it was worth posting to the lists for wider visibility and
discussion. For now I'll just carry these patches locally on my AVA
until I get a better system for PCI GPU experiments.

Thanks,

Alex.

Alex Bennée (1):
  ampere/arm64: instrument the altra workarounds

D Scott Phillips (2):
  ampere/arm64: Add a fixup handler for alignment faults in aarch64 code
  ampere/arm64: Work around Ampere Altra erratum #82288 PCIE_65

 arch/arm64/Kconfig                 |  22 +-
 arch/arm64/include/asm/insn.h      |   1 +
 arch/arm64/include/asm/io.h        |   3 +
 arch/arm64/include/asm/pgtable.h   |  29 +-
 arch/arm64/mm/Makefile             |   3 +-
 arch/arm64/mm/fault.c              | 726 +++++++++++++++++++++++++++++
 arch/arm64/mm/fault_neon.c         |  59 +++
 arch/arm64/mm/ioremap.c            |  38 ++
 drivers/pci/quirks.c               |   9 +
 include/asm-generic/io.h           |   4 +
 include/trace/events/altra_fixup.h |  57 +++
 mm/ioremap.c                       |   2 +-
 12 files changed, 945 insertions(+), 8 deletions(-)
 create mode 100644 arch/arm64/mm/fault_neon.c
 create mode 100644 include/trace/events/altra_fixup.h

-- 
2.39.2